body{font:16px/1.6 system-ui,sans-serif;max-width:46rem;margin:2rem auto;padding:0 1rem;color:#222}
h1,h2{line-height:1.25}nav a{margin-right:1rem}table{border-collapse:collapse}td,th{border:1px solid #ccc;padding:.3rem .6rem}
.todo{background:#fff3cd}